I’m trying out this simple C program [https://www.gnu.org/software/guile/manual/guile.html#Linking-Guile-into-Programs] that uses libguile. The hostname on my distro is called “guix”, but for some reason, it shows #f, which I’m assuming is the boolean value “false”, when I build and run the program normally: console $ ./simple-guile >(my-hostname) $1 = #f But when I create the environmental variables on the go, it works just fine? console $ HOSTNAME="hostname" ./simple-guile >(my-hostname) $1 = "hostname" I’ve confirmed the environmental variables by using echo, which works just fine: console $ echo $HOSTNAME guix Why am I seeing this peculiar behavior?